$$\left(n\cdot3n^3\cdot n^2\right)^3$$

$$234-\left(-500\right)$$

$$2x^2-4x-8=0$$

$$-0.78\cdot3.57$$

$$\frac{2x^3+x}{x+3}$$

$$\int\sin^3\left(3x\right)\cos^5\left(3\right)dx$$

$$x\left(a^2-b^2\right)+5\left(a^2-b^2\right)$$